Old Ariens 924038 engine issue. - Snowblower Forum : Snow Blower Forums
 
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post #1 of 10 Old 12-03-2019, 07:24 PM Thread Starter
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Old Ariens 924038 engine issue.

My old 7hp Tec. Snow King has developed an issue of loosing spark once the engine is heated up from normal operation. Let it cool off and spark will be back and engine will run untill it warms up again. I can duplicate this repeatedly. I thought I heard that this could be a sign of a bad coil. I replaced the original points and condensor about 5 years ago if that means anything.
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post #2 of 10 Old 12-03-2019, 08:19 PM
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Replace the coil, they go bad.
You mentioned once warm it dies, let it cool it goes again.
Its the coil

Ariens 924024 8 hp 32 now a 10 hp
Ariens 910008 7 hp 24
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post #3 of 10 Old 12-03-2019, 08:23 PM
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Yes, it is most likely a bad coil. But it might be a bad condenser. I would replace both. And look at the points while you are in there.

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post #4 of 10 Old 12-03-2019, 08:35 PM
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I've had that same symptom on an H70 and it was pitted points (link). Swapped the points and set the proper spark advance (0.080" B.T.D.C.) and she's been running smooooth ever since.


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post #5 of 10 Old 12-05-2019, 11:16 AM Thread Starter
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I just ordered a new coil, points and condenser. I'll try the coil first.
Someone mentioned the condenser, why can a condenser fail hot, work cold like coils are known to do?
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post #6 of 10 Old 12-05-2019, 01:15 PM
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It's the same mechanism in coils, condensers, or other electrical parts. Heat causes expansion in the internal parts of the component. The expansion can cause a circuit to open or to short circuit. When a component cools the fault can disappear. Old parts subject to vibration are prone to this type of failure. A new part can also experience this type of failure if there is a manufacturing defect. An intermittent fault can continue indefinitely, can become permanent at any time or disappear and not recur. Intermittents can drive you crazy. That's why sometimes it's best to shotgun it and replace everything that might be causing the problem.

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post #7 of 10 Old 12-05-2019, 03:24 PM
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Quote:
Originally Posted by dcinma View Post
I just ordered a new coil, points and condenser. I'll try the coil first.
Someone mentioned the condenser, why can a condenser fail hot, work cold like coils are known to do?
make sure you mark the magneto position before removing to replace the coil; the magneto's rotation (along with the points gap) determines the spark advance.


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post #8 of 10 Old 12-08-2019, 02:07 PM Thread Starter
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Still waiting on the parts. I think I'll shotgun everything to be sure.
I did time the engine the last time I replaced the points and condensor. I kind of forget how I did it. I didn't the Tecumseh tool. I pulled the head and somehow set it up to specs and it ran great for the last 5 or 6 years untill now. I think I put a machinests rule across the deck and used a shim of the correct thickness.
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post #9 of 10 Old 12-08-2019, 02:32 PM
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Please take pictures. I have the same machine.
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post #10 of 10 Old 12-26-2019, 10:07 AM Thread Starter
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Quote:
Originally Posted by malisha1 View Post
Please take pictures. I have the same machine.
Well it's all done and came out well. I kind of jumped ship and posted a question about the BTDC setting on a new thread and rest of the info is there. Hope it wasn't a violation of forum rules. Just look for my thread "Tecumseh BTDC clearance setting".

I did take some pictures don't know if they will help you, what are you specifically interested and maybe I can help.
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